var express = require('express');
var router = express.Router();

var XLSX = require('xlsx');


function datenum(v, date1904) {
  if(date1904) v+=1462;
  var epoch = Date.parse(v);
  return (epoch - new Date(Date.UTC(1899, 11, 30))) / (24 * 60 * 60 * 1000);
}
 
function sheet_from_array_of_arrays(data, opts) {
  var ws = {};
  var range = {s: {c:10000000, r:10000000}, e: {c:0, r:0 }};
  for(var R = 0; R != data.length; ++R) {
    for(var C = 0; C != data[R].length; ++C) {
      if(range.s.r > R) range.s.r = R;
      if(range.s.c > C) range.s.c = C;
      if(range.e.r < R) range.e.r = R;
      if(range.e.c < C) range.e.c = C;
      var cell = {v: data[R][C] };
      if(cell.v == null) continue;
      var cell_ref = XLSX.utils.encode_cell({c:C,r:R});
      
      if(typeof cell.v === 'number') cell.t = 'n';
      else if(typeof cell.v === 'boolean') cell.t = 'b';
      else if(cell.v instanceof Date) {
        cell.t = 'n'; cell.z = XLSX.SSF._table[14];
        cell.v = datenum(cell.v);
      }
      else cell.t = 's';
      
      ws[cell_ref] = cell;
    }
  }
  if(range.s.c < 10000000) ws['!ref'] = XLSX.utils.encode_range(range);
  return ws;
}
 
/* original data */
var data = [[1,2,3],[true, false, null, "sheetjs"],["foo","bar",new Date("2014-02-19T14:30Z"), "0.3"], ["baz", null, "qux"]]
var ws_name = "SheetJS";
 
function Workbook() {
  if(!(this instanceof Workbook)) return new Workbook();
  this.SheetNames = [];
  this.Sheets = {};
}
 
var wb = new Workbook(), ws = sheet_from_array_of_arrays(data);
 
/* add worksheet to workbook */
wb.SheetNames.push(ws_name);
wb.Sheets[ws_name] = ws;
var wbout = XLSX.write(wb, {bookType:'xlsx', bookSST:true, type: 'binary'});




/* GET users listing. */
router.get('/33', function(req, res, next) {
  // res.send('respond with a resource');

  res.setHeader('Content-Type', 'application/vnd.openxmlformats');
  res.setHeader("Content-Disposition", "attachment; filename=" + "Report.xlsx");
  
  var result = wbout;

  res.end(result, 'binary');



});

module.exports = router;
